protected void recvChallengeAck(int our_challenge)
{
byte[] her_digest = new byte[16];
try
{
byte[] buf = read2BytePackage();
OtpInputStream ibuf = new OtpInputStream(buf, 0);
int tag = ibuf.read1();
if (tag != ChallengeAck)
{
throw new IOException("Handshake protocol error");
}
ibuf.readN(her_digest);
byte[] our_digest = genDigest(our_challenge, self.Cookie);
if (!digests_equals(her_digest, our_digest))
{
throw new OtpAuthException("Peer authentication error.");
}
}
catch (OtpErlangDecodeException)
{
throw new IOException("Handshake failed - not enough data");
}
catch (Exception)
{
throw new OtpAuthException("Peer authentication error.");
}
if (traceLevel >= handshakeThreshold)
{
log.Debug("<- " + "HANDSHAKE recvChallengeAck" + " from="
+ peer.Node + " digest=" + hex(her_digest) + " local=" + self);
}
}
protected int recvChallenge()
{
int challenge;
try
{
byte[] buf = read2BytePackage();
OtpInputStream ibuf = new OtpInputStream(buf, 0);
peer.Type = ibuf.read1();
if (peer.Type != AbstractNode.NTYPE_R6)
{
throw new IOException("Unexpected peer type");
}
peer.DistLow = peer.DistHigh = ibuf.read2BE();
peer.Flags = ibuf.read4BE();
challenge = ibuf.read4BE();
byte[] tmpname = new byte[buf.Length - 11];
ibuf.readN(tmpname);
String hisname = OtpErlangString.newString(tmpname);
if (!hisname.Equals(peer.Node))
{
throw new IOException("Handshake failed - peer has wrong name: " + hisname);
}
if ((peer.Flags & AbstractNode.dFlagExtendedReferences) == 0)
{
throw new IOException("Handshake failed - peer cannot handle extended references");
}
if ((peer.Flags & AbstractNode.dFlagExtendedPidsPorts) == 0)
{
throw new IOException("Handshake failed - peer cannot handle extended pids and ports");
}
}
catch (OtpErlangDecodeException)
{
throw new IOException("Handshake failed - not enough data");
}
if (traceLevel >= handshakeThreshold)
{
log.Debug("<- " + "HANDSHAKE recvChallenge" + " from="
+ peer.Node + " challenge=" + challenge + " local=" + self);
}
return challenge;
}
protected void recvStatus()
{
try
{
byte[] buf = read2BytePackage();
OtpInputStream ibuf = new OtpInputStream(buf, 0);
int tag = ibuf.read1();
if (tag != ChallengeStatus)
{
throw new IOException("Handshake protocol error");
}
byte[] tmpbuf = new byte[buf.Length - 1];
ibuf.readN(tmpbuf);
String status = OtpErlangString.newString(tmpbuf);
if (status.CompareTo("ok") != 0)
{
throw new IOException("Peer replied with status '" + status + "' instead of 'ok'");
}
}
catch (OtpErlangDecodeException)
{
throw new IOException("Handshake failed - not enough data");
}
if (traceLevel >= handshakeThreshold)
{
log.Debug("<- " + "HANDSHAKE recvStatus (ok)" + " local=" + self);
}
}
protected void recvName(OtpPeer peer)
{
String hisname = "";
try
{
byte[] tmpbuf = read2BytePackage();
OtpInputStream ibuf = new OtpInputStream(tmpbuf, 0);
byte[] tmpname;
int len = tmpbuf.Length;
peer.Type = ibuf.read1();
if (peer.Type != AbstractNode.NTYPE_R6)
{
throw new IOException("Unknown remote node type");
}
peer.DistLow = peer.DistHigh = ibuf.read2BE();
if (peer.DistLow < 5)
{
throw new IOException("Unknown remote node type");
}
peer.Flags = ibuf.read4BE();
tmpname = new byte[len - 7];
ibuf.readN(tmpname);
hisname = OtpErlangString.newString(tmpname);
// Set the old nodetype parameter to indicate hidden/normal status
// When the old handshake is removed, the ntype should also be.
if ((peer.Flags & AbstractNode.dFlagPublished) != 0)
{
peer.Type = AbstractNode.NTYPE_R4_ERLANG;
}
else
{
peer.Type = AbstractNode.NTYPE_R4_HIDDEN;
}
if ((peer.Flags & AbstractNode.dFlagExtendedReferences) == 0)
{
throw new IOException("Handshake failed - peer cannot handle extended references");
}
if ((peer.Flags & AbstractNode.dFlagExtendedPidsPorts) == 0)
{
throw new IOException("Handshake failed - peer cannot handle extended pids and ports");
}
}
catch (OtpErlangDecodeException)
{
throw new IOException("Handshake failed - not enough data");
}
int i = hisname.IndexOf('@', 0);
peer.Node = hisname;
peer.Alive = hisname.Substring(0, i);
peer.Host = hisname.Substring(i + 1, hisname.Length - (i + 1));
if (traceLevel >= handshakeThreshold)
{
log.Debug("<- " + "HANDSHAKE" + " ntype=" + peer.Type
+ " dist=" + peer.DistHigh + " remote=" + peer);
}
}
private void r4_publish(TcpClient s, OtpInputStream ibuf)
{
try
{
int port = ibuf.read2BE();
int type = ibuf.read1();
int proto = ibuf.read1();
int distHigh = ibuf.read2BE();
int distLow = ibuf.read2BE();
int len = ibuf.read2BE();
byte[] alive = new byte[len];
ibuf.readN(alive);
int elen = ibuf.read2BE();
byte[] extra = new byte[elen];
ibuf.readN(extra);
String name = OtpErlangString.newString(alive);
OtpPublishedNode node = new OtpPublishedNode(name);
node.Type = type;
node.DistHigh = distHigh;
node.DistLow = distLow;
node.Proto = proto;
node.Port = port;
if (traceLevel >= traceThreshold)
{
log.Debug("<- PUBLISH (r4) " + name + " port=" + node.Port);
}
OtpOutputStream obuf = new OtpOutputStream();
obuf.write1(publish4resp);
obuf.write1(0);
obuf.write2BE(epmd.Creation);
obuf.WriteTo(s.GetStream());
lock (portmap)
{
portmap.Add(name, node);
}
publishedPort.Add(name);
}
catch (IOException)
{
if (traceLevel >= traceThreshold)
{
log.Debug("<- (no response)");
}
throw new IOException("Request not responding");
}
return;
}
private void r4_port(TcpClient s, OtpInputStream ibuf)
{
try
{
int len = (int)(ibuf.Length - 1);
byte[] alive = new byte[len];
ibuf.readN(alive);
String name = OtpErlangString.newString(alive);
OtpPublishedNode node = null;
if (traceLevel >= traceThreshold)
{
log.Debug("<- PORT (r4) " + name);
}
lock (portmap)
{
if (portmap.ContainsKey(name))
{
node = portmap[name];
}
}
OtpOutputStream obuf = new OtpOutputStream();
if (node != null)
{
obuf.write1(port4resp);
obuf.write1(0);
obuf.write2BE(node.Port);
obuf.write1(node.Type);
obuf.write1(node.Proto);
obuf.write2BE(node.DistHigh);
obuf.write2BE(node.DistLow);
obuf.write2BE(len);
obuf.writeN(alive);
obuf.write2BE(0);
}
else
{
obuf.write1(port4resp);
obuf.write1(1);
}
obuf.WriteTo(s.GetStream());
}
catch (IOException)
{
if (traceLevel >= traceThreshold)
{
log.Debug("<- (no response)");
}
throw new IOException("Request not responding");
}
return;
}
